Year	Kilotonnes
1850	0
1851	0
1852	0
1853	0
1854	0
1855	0
1856	0
1857	0
1858	0.00001
1859	0.00001
1860	0.00001
1861	0.00001
1862	0.00001
1863	0.00001
1864	0.00001
1865	0.00001
1866	0.00001
1867	0.00001
1868	0.00001
1869	0.00001
1870	0.00001
1871	0.00001
1872	0.00001
1873	0.00001
1874	0.00002
1875	0.00002
1876	0.00002
1877	0.00002
1878	0.00002
1879	0.00002
1880	0.00002
1881	0.00003
1882	0.00004
1883	0.00005
1884	0.00006
1885	0.00007
1886	0.00008
1887	0.00009
1888	0.0001
1889	0.00012
1890	0.00013
1891	0.00013
1892	0.00014
1893	0.00014
1894	0.00014
1895	0.00014
1896	0.0002
1897	0.00026
1898	0.00031
1899	0.00038
1900	0.00044
1901	0.00053
1902	0.00082
1903	0.00115
1904	0.00197
1905	0.0018
1906	0.00208
1907	0.00248
1908	0.00277
1909	0.00294
1910	0.00304
1911	0.00326
1912	0.00409
1913	0.00466
1914	0.00366
1915	0.00273
1916	0.00456
1917	0.00426
1918	0.00385
1919	0.00293
1920	0.00352
1921	0.00346
1922	0.00415
1923	0.00473
1924	0.00498
1925	0.00496
1926	0.00637
1927	0.00621
1928	0.0062
1929	0.00605
1930	0.00566
1931	0.00565
1932	0.00906
1933	0.01231
1934	0.00935
1935	0.01137
1936	0.0156
1937	0.01782
1938	0.02243
1939	0.02223
1940	0.01738
1941	0.01725
1942	0.01448
1943	0.01142
1944	0.01506
1945	0.01607
1946	0.01848
1947	0.02182
1948	0.02354
1949	0.02606
1950	0.0418
1951	0.1411
1952	0.09193
1953	0.08635
1954	0.04225
1955	0.1794
1956	0.1946
1957	0.1997
1958	0.1399
1959	9.665
1960	22.22
1961	22.67
1962	21.46
1963	23.51
1964	25.34
1965	23.4
1966	22.98
1967	23.95
1968	24.07
1969	25.88
1970	27.2
1971	32.77
1972	25.43
1973	26.63
1974	23.2
1975	23.83
1976	32.64
1977	55.98
1978	50.01
1979	81.46
1980	107
1981	151.9
1982	135.2
1983	129.3
1984	145.9
1985	130.7
1986	148.6
1987	143.3
1988	154.9
1989	146.8
1990	129.5
1991	139.8
1992	138.1
1993	146.7
1994	160
1995	175.9
1996	221.4
1997	260
1998	282.9
1999	320.9
2000	339.7